KLOVE, T. On Exponential Recurring Sequences. MATHEMATICA SCANDINAVICA, [S. l.], v. 34, p. 44–50, 1974. DOI: 10.7146/math.scand.a-11503. Disponível em: https://www.mscand.dk/article/view/11503. Acesso em: 5 may. 2024.